This sounds like a pretty clear indication that at least this juror was voting based on something other than what Libby was charged with and other than the evidence presented in the case.
Makes me wonder if it's grounds for a mistrial.
No, it isn't. Libby turned out to be the fall guy in a sense that he was the only one that Fitz could get for anything. Libby's defense was simply not believable enough to the 11 jurors for what he was accused of doing.
Contrary to popular thinking here, it might very well be that Libby got caught playing games. He's a lawyer and he's represented a scumbag like Marc Rich so let's not pretend that there's no chance he didn't BS the investigators on this. I would have preferred a real trial and the truth about Wilson, his wife and her bosses at the CIA come out.